Punch-css tbbim g- machiwe



Dec. 22, 1925.

' A. SCHWANZ PUNCH CENTERING MACHINE Filed Feb; 9. 1925 illm complish eiiiciently the @objects stated'.

'4 4 of Fig. 2, and Fig. 5 is a sectional elevationon the line" Unirse sr Patented Dec. 22, 1925.

A T, E 5

PATENT FHCE.. y

ALBERT soHWANz', or s-r. LOUIS, MISSOURI. l

rUNei-c'nnrnnine- MACHINE.

application sied February 9, 1925. serrai- No. 8,035.

To all whom t may conce/m."

Be it known that ALBERT SCHWANZ, a citizen of the Republicvol` Germany, residing vat St. Louis, State of Missouri, has invented certain new and useful Improvements in Punch-Centering Machines, of which the following' is a specification.l n

The object of my,` deviceis to make a punch centering machine to be used particuw larly for locating exact centers for varying machine operations. A furtherobject 'is to make a device that will exactly locate andy punch the center of rods and bars of cross sections of different geometricalshapes.- 1A further object of my device is to devise a machine for the locatingl and drawing et' llend themselves readily to multiple production, that may be easily assembled and taken apart, and that can be for these reasons r cheaply and etliciently made.

lVith these and other objects in view, my

invention hasrelation to certain novel fea* `tures otv construction and arrangement `o parts as will be hereinafter more fully described, pointed 'outin the claims, and.

lustrated in the drawings in which, j Fig. l is a plan view of my device, andl i Fig. 2 isa side elevation of my device, and Fig. 3 is a sectional elevation ontheline 3-3 of Fig.' 2, and I y Fig. l is a sectional elevation on thevline 5y of Fig. 2,` and Fig. 6 isfan inverted tra'gmental planet my device' when used forv` locatingcenterson cylindrical cross sectionspand Fig. 7is an invertedplan ofemyjdevice when used for lecatingfcenters. otrods or bars of non-circular sections. y I I Fig. 8 is a sectional elevation onr theV line 8-8 of Fig. 7, showing the mean's'i-or selecf tively detachably securing a graduated scale to my device. y

Fig. 9 is a sectional elevation of the punch guide 40 and theJ stud v34,.togetherswitliftlieir` 'A (joining means and a."raginental'elevation ofr the U shaped member 28. Fie'.` l() is v a mental end elevation of my device.

theT section member `11,0.' .y l Numeral 12 designates'ay handle formed integrally with the T section member 10 at its center. At the jointure between -the handle 12 and the'T section member 1 0, beneath the slotted member 11 is formed the reci r tangularrcavity 13. Theslot of theslotted member 11 extends to the top'of the rec- 'l\lun ieral 9 designates af T square having f ltheT section' member 1,0 andl slotted member 11 formed` integral' at right anglesfto t'angular cavity 13. The slot 14; of the slotted member 1.1 y'extends longitudinally almost to the outer end of the slotted member 11, as is clearly shown inFig/l. `The-handle .12 is so positioned that a central line passing throughthe slotlt willk pass vthrough the center of the handle A groov.ej1501 4graduation is marked on vthe top in thecenter ofthe handle V12.' This groove 15 is con- ,tinued to the-left in Fig. kl to the rightjend of the'. slot 14 in Fig. 1. Near the end oi'f'A i. one of the arms of T square@ 9 is integrally formed the arm 16, to which issecure'd lthe rpostv 17. The post 17 consists of the thread ed rod 18 vpassing through'a h0lef19 lnear the end of. the arm 16. .The winged nus.

20 is in-threaded engagement Withfthe end of vthe threaded rod 18 belowy the hole j 119.- Byy ymeans of the threadedrod 18'an'df the winged/nut v20, thepos't y1'? ,mayfbel firmly secured to .the arm l16.v In order toisecure .the extension member 21 to the'pos't 1,'a

hole slightlylarger thanl the-extension member 21 is forinednearv the top of thepost'l?.

Into thishole the extension member 21, may

wbe inserted.l In orderto `secure `the eXtensionmember 21 in any particular position,

the setl screw 22 isfprovided,whi ch is'in threadedengagement inta hole at the top of ,they post 17,5andextends to .the lhole inthe postv 17.r In ordertofpreventl the extension i member 21fro1ii turning when in position in the Apostl, lofnefaceoti't'xrnay,be flattened. 'Y l n To` th'e'vfree end; of'the'ezrten'sion member 21 is secured the Vfinger'2.3;, which is secured to the extensionA member 21,v by virtue ofhav l Vj ing a 'cup formed :in its inner end intofwhi'ch j y g the end of the extension member 21 may be y positioned. A set screw Qaisinthreaded engagement 1n a hole in'fthe linger, 23, and

of `suoli length as to come in contactwith the d ofthe'U shaped member 28 has an L Ythe U shaped member 28. ofthe stud 84 is'threaded.

f' slotted member' 11.

end of the extension .member 21. To the end of the finger 28 is integrally secured the marking rod 25. At right angles'A there- Vmember 10 by means of the studs 29 formed on the T 'section member 10 and the nuts in'threaded engagement on the ends of the studs and over the U shaped member 28. The studs 29 pass through holes in the U'sliaped'member l28. The opposite end of L the* U shaped member 28 is secured to the "slotted member 11 bym'eans'of afstud 80a.

vThe stud 8O is securedto theslotted'mem- Vlber 11,` passing through 'the end of vthel slot in' the 'U shaped member 28, and through the washer`81. The washer is ofav diameter 'larger than the 'width of the Vslot in the 'U shaped member 28. A pin 82 passes through a hole in the top'of the stud 80". Each arm section.

Numeral 88`designates a plate slidably secured between theslottedmember 11 k'and the Ushape'dm'ember 28. rlhis plate may be moved'the entire lengthof the slot in the A stud 84 is mounted in thefcenter of the plate 88 and Xtends through theslot 14 and 'through the slot of K The upper 'end A'plate 85 having 'a hole Ain its center is positioned on vthe L U shaped member 28 over the'st'ud84. On theunder surface of the plate aprojection' 88 is formed ofv a width slightly less Ythan the ``width of the slot in the U shaped member28,`so that the plate 85 may-be slid inthe slot'of'the U 'shaped member 28. The projection' 86facts`as a guide for this sliding operation. l y K l vNi'uneral 87 designates a nut in threaded engagement on the stud A84. By-tightening At-he nut 87 against the plate8'5,"the plate'88 is'broughtupwardly against the lower sur- `faceof the'slot of the'U shaped member`28.

Y Bythisineans the 'plate 88 maybesecured in any position. The lplate 88 has an integral upward extension 88 formed at right angles therewith and extending through the slot in the' U shaped member 28. To this extensiony 88 bymeans of the screws 8 9, the punch guide 40 is fastened. A longitudinal hole L41 passes through the punch guide 40. V`Numeral 42 designates :the punch having :la point 48 and the vshaft 44. vdesignates a sleevein sliding engagement on the'shaft 44 of the punch '42. vNumeral :46 designatesa coiled spring positioned over the 'shaft 44 of the punch' 42, above the punch guide 40 and belowT Athe sleeve 45. Numeral '47 Ydesignates a slotted finger secured `to the 'sleeve 45 by means of the screw 48. The Vslotted iinger 4T extends in of the slotted 'ringer 47, the

Numeral 45 falling out ofthe punch guide-40. The slot* in the slotted linger '47 is of'such:length'that when the stud 49 is at the bottom of the slot point '48"of the punch 42 will notprotrude beyondv the'lower end of the longitudinal hole 41 in `the punch guide 40. The purpose ofthe coiled spring 46 istoreturnl the punch 42 to the position Ajust indicated, after the spring has been compressed and the punch lowered so that the point 48 of the punch 42 vextends beyond the lower surface of-the punch'guide 40, that is out of the longitudinal hole 41 of the punch guide 40.

For purposes to be described in the operation of my device l have. provided a graduated ruler or scale 50, which is positioned on the one lateral face of theU shapedmember 28. y

'On the side of the punch guide l40 adjacent the' rule 50 is secured the pointed linger 52. The point of the pointed'iinger 52 when the punch guide 40 is moved longitudinally in the. U "shaped member 28 moves directly over the graduated scale'or ruler 50. rlhis point is in the same vertical :plane'as the point of the punch 42. The exact distance vthat the center ofthe punch is positioned from the zero on the rule 50, whichis'at the right end in the figures in the drawing may be easily determined by reading fthe graduation on the scale or rule 50`immedi- Yately beneath the point of the pointed finger 52. ln order to punch va centerat a certain distance from the edge of Van object, it is only necessary to place' my deviceso that the center ofthe punch 42 is'at the desired positio-n, tighten the nut 87 and stri'lethetop hand. This will move the punch and make the mark at the desired place; rlhe spring `that whenthe's'tud' 55 is inserted in the hole 58, the point of its opposite end will protrude to the absolute corner ofthe rectangular cavity 18.

4of the punch 42a blow with thefpalm ofthe In locatin`g the center ofabarlaving-a square cross section, iit-is onlyhnec'essary.` to 'position the bar i -in my; l device 1 .so that its end will be in contactv with the scale;54 -when in position, L and its one gedge., positioned in the rectangular cavity 1,3., fasshown 'IF 7. The length of the diagonaLofthe Asquare cross sectionmaybefdirectly read on the scale 54, this distance is divided Vby two and the point of the pointedfinger 52 placed above. the graduation on .the rule representingV that distance. tightened, the scale 54 removed, Aand the punch 42 given the blow with the `hand necessary to operate it, as previously described. A punch hole will then be made in th exact center of the squaresection of the ro When it is desired to obtain thecenter of a circular bar section, the scale 54is placed in position and the end of the bar of circular section is placed as shown in Fig. 6 with its face against the rule 54 and its sides in con` tact as far as possible in the rectangular cavity v13. It will be seen that since the scale 54 has its zero graduation at the apex of the rectangular cavity 13, and that since the vsurface now to be measured does not come to that point, that the center of the circular section could not be obtained by dividing the distance by two, as was done in the case of the square section. In order to find the center, therefore, it becomes necessary to read the-distance on the scale v54 to the outer periphery of the circular rod,

and then to subtract the distance between the other and oppositesurface of the" rod and the zero on the scale 54, and then dividing this distance by two.

This radial distance may thenbe located on the rule 50 in the same manner that it was previously located.

kA vertical graduation 15 is positioned in the center of the rear face. of the punch guide 40. In order to punch a series of holes in a line perpendicular to another line or surface, it is only necessary to position -my device as a T square `against the edge and to sight along the graduation 15 onthe handle 12 and on the punch guide 40. These lines are in the same vertical plane with the point 43 of thev punch 42. These I punch marks on this line'may be located a prede.- termined distance from any desired line and a predetermined distance between each other by the use of therule 50. l

Another example of the use of my device is for the following work. Assume we have a rectangular bar of metal two 'feet in length and three inches vwide and of any thickness. It is desired thatV holes be drilled four inches apart and in the center of the width. Byk means of the rule 50 set the point 43 to the graduation reading one and onehalf inches, that is to say, one-half of the The nut 37 is then 'widthfo-f the 'bar,.then withy .1a-rule `Lineasur,fea f distance; of Y four inches' from the lefty end lof dicated, or by striking it with a` hammer.y The punchmark made will be exactly four inchesffrom the left end Vof the bar yand midway betweengthefsides of the bar. In order to'make the second punch mark on the same line, but four inches to the right of thefirstA soy pun'chmark,fproceed as before. Thisprocj ess may be continued for each of the .punch marks. lIn order to obviate thenecessity of measuring the four inch distance between each Vsubsequent punch mark, after the second center punch'hole is made, the following method and parts of my device are used. The center punch y42 is held manually in the second hole by adjusting theextension member 21, the point of the marking. rod 25,"or of thelead pencilv 27 may be placed in the first punch Y mark. l When this` is accomy plished, the extension member 2l is secured in its position by themethod previously` described. The distance between the point` 43 of the punch 42 andthe point ofthe ina-rk ping' rod 25 will now be'exactly 'four inches.

In order to make the subsequent` center punch marks when the device islin the adjusted position just indicated, the device need only be moved to the right so that the point of the'marking rod 25 will be in the second hole and the T square positioned.

By striking the center punch 42 the thirdV center punch mark will be made. This may be` continued for each subsequent marking.' This latter method can, of course, not be used for distances greater than permitted bythe length of the extension member 21, nor

for distances less than half the Width of the U shaped member 28.v

When the distance between the punch-'H-A V 'y lmarks varies, the extension member-21 cannot be used. In that event, the former methoddescribed must be continued.

What I claim ters Patent is,A y

and mean to secure by Ilet- 1. In combination-with a T squarefa. y

punch guide slidablyl secured thereon, a punch slidably secured'in said punch guide,A

' a sleeve secured to said punch,a slotted arm secured to said sleeve, a stud secured to said punch guide 1n sliding engageinentin the slot of said slotted arm, a spring positioned on said punch between said sleeve and said ipunch guide.

2. In VcombinationI with a T` square, an i' punch,l a punch guide anda pointed finger,

4said punch operatively secured in said punch guide, said punch guide inxsliding en- 

